Circor G3D**-350 Series User manual

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PRODUCT SERVICE MANUAL
FOR
_G3D_ _-350 and 400 SERIES PUMPS
(Idler Cup and Hydrostatic Thrust Designs)
WARNING
The Imo General Installation Operation, Maintenance, and Troubleshooting Manual, (No.
SRM00046), as well as all other component manuals supplied with these type units
should be read thoroughly prior to pump installation, start-up, operation, maintenance or
troubleshooting.
Manual No. SRM00080 Rev. 04 (13-0321) September 2013

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IMPORTANT NOTE
The importance of seal chamber priming cannot be overemphasized. Due to the
prevalence of seal damage and leakage caused by not filling the seal chamber with
liquid before putting a pump in service, this page is located at the beginning of this
document.
SEAL CHAMBER PRIMING
Fill mechanical seal chamber with liquid to insure seal does not start dry. This can be done by removing
seal vent set-screw and pouring liquid into vent passageway before opening pump inlet. Alternately,
seal chamber can be vented in situations where inlet pressure is above atmospheric by opening inlet and
discharge valves and then loosening seal vent plug to allow positive inlet pressure to push air out of seal
chamber until oil flows from it. See figure below.
Filling or Venting Seal Cavity Using Seal Vent
CAUTION
Failure to fill or vent seal chamber as described above may cause damage to seal running
faces which may result in seal leakage.

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READ THIS ENTIRE PAGE BEFORE PROCEEDING
FOR SAFETY OF PERSONNEL AND TO PREVENT DAMAGE TO EQUIPMENT, THE FOLLOWING
NOMENCLATURE HAS BEEN USED IN THIS MANUAL:
DANGER
Failure to observe precautions noted in this box can result in severe bodily injury or loss of life.
WARNING
Failure to observe precautions noted in this box can cause injury to personnel by accidental
contact with equipment or liquids. Protection should be provided by user to prevent accidental
contact.
CAUTION ATTENTION
Failure to observe precautions noted in this box can cause damage or failure of equipment.
Non compliance of safety
instructions identified by
the following symbol
could affect safety for
persons:
Safety instructions where
electrical safety is
involved are identified by:
Safety instructions which shall be
considered for reasons of safe
operation of pump and/or protection of
pump itself are marked by the sign:
ATTENTION
ATTENTION
If operation of pump is critical to your business, we strongly recommend you keep a spare pump
or major repair kit in stock at all times. As a minimum, a minor repair kit (o-rings, gaskets, shaft
seal and bearings) should be kept in stock so pump refurbishment after internal inspection can
be accomplished.
CONTENTS
Seal Chamber Priming…………………………………………………………………………………..2
Safety and Table of Contents......................................................................................................3
A. General Instructions..............................................................................................................4
B. Introduction...........................................................................................................................4
C. Description of Equipment......................................................................................................4
D. Pump Model Identification.....................................................................................................5
E. Ordering Instructions.............................................................................................................5
F. Operation..............................................................................................................................6
G. Parts List and Noise Levels.........................................................................................7 thru 8
H. Pump Maintenance and Seal Drawing .......................................................................8 thru13
I. Troubleshooting ..................................................................................................................14
J. Field and Factory Service and Parts....................................................................................14
K. Assembly Drawings.................................................................................................15 thru 18

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A. GENERAL INSTRUCTIONS
Instructions found herein cover disassembly, assembly and parts identification of _G3D _-350 and 400
series pumps. Both original design with idler cups and newer design with hydrostatic idlers are covered
where applicable.
NOTE: Individual contracts may have specific provisions that vary from this manual. Should any
questions arise which may not be answered by these instructions, refer to Imo General
Installation Operation, Maintenance, and Troubleshooting Manual,SRM00046, provided with
your order. For further detailed information and technical assistance please refer to Imo Pump,
Technical/Customer Service Department, at [phone].
Manual cannot possibly cover every situation connected with installation, operation, inspection, and
maintenance of equipment supplied. Every effort was made to prepare text of manual so that engineering
and design data is transformed into most easily understood wording. Imo Pump must assume personnel
assigned to operate and maintain supplied equipment and apply instruction manual have sufficient
technical knowledge and are experienced to apply sound safety and operational practices which may not
be otherwise covered by this manual.
In applications where equipment furnished by Imo Pump is to become part of processing machinery,
these instructions should be thoroughly reviewed to ensure proper fit of said equipment into overall plant
operational procedures.
WARNING
If installation, operation, and maintenance instructions are not correctly and strictly followed and
observed, injury to personnel or serious damage to pump could result. Imo Pump cannot accept
responsibility for unsatisfactory performance or damage resulting from failure to comply with
instructions.
B. INTRODUCTION
This instruction manual covers series _G3D_ _-350 and 400 Imo pumps. This series of pumps has been
designed for use in hydraulic, lubricating, seal, distillate, residual, fuel and crude oil applications. The
model and design construction of each pump can be identified by the designator code on the pump
nameplate. Definitions of model designators are identified in figure 1.
C. DESCRIPTION OF EQUIPMENT
_G3D_ _-350 and 400 Series pumps are positive displacement, rotary screw pumps consisting of a
precision bored housing which encloses a driven screw (power rotor) and two intermeshing following
screws (idler rotors). These screws when rotating form a succession of closures or cavities. As they
rotate, fluid is moved axially from inlet port to outlet port in a continuous, uniform flow with minimum fluid
pulsation and pump noise.

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D. PUMP MODEL IDENTIFICATION
Instruction manual covers Imo Series _G3D-350 and 400 pumps. Model of each pump is identified on
pump nameplate. Refer to figure 1 and table 1 for instructional keys when using manual.
Figure 1 – Model Designator Definitions
X G 3D X X X X 350 X
Basic Pump Modifiers -
A –Latest Mod
B –Hard Face Seals
E –High Vacuum Service
(300# ANSI Flange)
H –High Vacuum Service
(150# ANSI Flange)
Series
1st Letter Designator (Seal Design)
B –Rubber Bellows (Buna Fitted Std. Bearing)
H –Positive Drive (Viton O-ring Fitted, Hi-
Temp. Bearing)
K –Special Mounting, No Seal
N –Metal Bellows Seal Viton Fitted
X –Special Seal
Lead and Rotation
350 Rotor Size
Blank = 2D,CW D = 2D, CCW
G=1.8D, CW H = 1.8D, CCW
J=1.5D CW P = 1.6D CW
AN = 1.25D CW
400 Rotor Size
Blank = 2D,CW D = 2D, CCW
P=1.6D,CW AJ = 1.35D, CW
A=1.0D, CW
Rotor Size
350
400
4th Letter Designator
T –Carbide Seat
X –Special Material Or
Construction
3rd Letter Designator
S –Steel casing
T –Carbide Seat
X –Special Material Or Construction
2nd Letter Designator
C –Circular Mounting Flange
H –Special Mounting Flange
(Usually with previous letter K)
R –Axial Inlet
S –Steel Casing
T –Carbide Seat
X –Special Material Or
Construction
Design Modification
E. ORDERING INSTRUCTIONS
When corresponding with Imo Pump regarding Series _G3D_ _-350 and 400 series pumps, refer to
pump nameplate, this instruction manual, and assembly drawing as instructed below:
1. From pump nameplate, record pump model number, serial number, and manufactured date.
2. Record instruction manual number, revision, and date.
3. From instruction manual, record figure numbers that apply to replacement part(s).
4. From assembly drawing or parts list (see table 2) provide IDP number(s) and names for replacement
part(s).
5. Give above information to your Imo service representative.
Imo sales and service representatives are listed herein and in General Instruction Manual, SRM00046.

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F. OPERATION
F.1 LIQUID LIMITATIONS
Never operate with thin liquids such as solvents or water. Pump is designed for liquids having
general characteristics of oil.
F.2 OPERATING LIMITS
CAUTION
ATTENTION
Operating conditions, such as speed, fluid viscosity, temperature, inlet pressure, discharge
pressure, filtration, duty cycle, drive type, mounting, etc., are interrelated. Due to these
variable conditions, specific application limits may be different from operational limitations.
Equipment must not be operated without verifying system operating requirements are
within pump’s capabilities.
Under no circumstances are the following operating limits (specified in table 1) to be exceeded
without specific approval from Imo Pump.
Table 1 – Normal Pump Operating and Structural Limits
Condition
Limit
Maximum Speed
2500 rpm
Minimum Viscosity
32 SSU
Maximum Viscosity (figure 1)
1st Letter Designator B
2500 SSU
1st Letter Designator H
15000 SSU
Minimum Liquid Temperature
0°F
Maximum Liquid Temperature (figure 1)
1st Letter Designator B
180°F
1st Letter Designator H
220°F
Maximum Inlet Pressure
50 psig
Maximum Discharge Pressure (Continuous Duty)
500 psig
Filtration
Refer to General Instruction Manual, CA-1
Drive
Direct or Belt
Mounting
Foot mounted in any attitude
F3 Airborne Noise Levels (dBA) –
F3a – Measuring Conditions
•Distance to Pump = 1 Meter
•Operation = Cavitation Free
•Tolerance ± 3 dB

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3D Airborne Levels
50
54
58
62
66
70
74
78
82
86
90
94
020 40 60 80 100 120 140 160
Horsepower
Airborne Noise Level (dBA)
Figure 2 – Airborne Levels
G. PARTS LIST Table 2 – _G3D_-350_ Pump Parts List
IDP
QTY
DESCRIPTION
KIT
IDP
QTY
DESCRIPTION
KIT
1
1
Case
24
2
Washer
2
1
Housing
XX
25
2
Mechanical Seal**
X
4
1
Anti-Rotation Tube
26
1
Inlet
5
2
Tube O-rings
X
30
4
Washers (C-Face Only)
6
2
Housing/Inboard Cover O-
ring
X
32
2
Pipe Plug (Foot Mount Only)
8
2
Gasket (1 on C-Face)
X
33
1
Balance piston Bushing
(C-face pumps only)
XX
9
1
Inboard Cover
35
2
Pipe Nipple (C-Face Only)
10
16
Hex Bolts
36
1
Pipe Coupling (C-Face Only)
11
1
Power Rotor
XX
37
1
Tube Fitting (C-Face Only)
13
2
Snap Rings
X
38
1
Seal Spacer *
14
1
Spacer/Seal Seat Adapter
X
42
1
Tubing (C-Face Only)
15
1
Bearing
X
43
1
Housing Spacer
16
1
Key
44
1
Gasket (O-ring Seats Only)
X
17
1
Bearing Retainer
45
1
Fastener Seal
X
18
4
Bearing Retainer Hex Bolts
46
1
Pin Stop
XX
19
2
Idlers
XX
47
1
Balance Piston Housing
(Not C-Face)
XX
20
2
Idler Cups (Idler Cup Design
Only)
XX
57
1
90° Tube Fitting (C-Face Only)
21
1
Thrust Plate
XX
88
1
Inlet O-ring
(Axial inlet pumps only)
X
22
2
Thrust Spacer
92
16
Washers (C-Face Pumps Only)
23
2
Hex Cap Screws
X = Minor Repair Kit Items.
XX = Major Repair Kit Items. (Items marked (X) are included in Major Repair Kit.)
* = Not used in “DKH” pumps.

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Table 3 – _G3D_-400_ Pump Parts List
IDP
QTY
DESCRIPTION
KIT
IDP
QTY
DESCRIPTION
KIT
1
1
Case
43
1
Bearing Retainer
2
1
Inlet
46
1
Inboard Cover
4
8
Hex Bolt (Foot Mount Only)
47
4
Brg. Retainer Hex Bolts
5
2
Pipe Plug (Foot Mount Only)
48
1
Bearing Spacer
(J-Seat Seal and DKH Only)
6
1
Pin Stop
XX
49
1
Bearing
X
7
1
Fastener Seal
X
50
1
Housing Spacer
9
2
Gasket (1 for C-Face)
X
51
2
Thrust Spacer
21
2
Idler
XX
52
2
Thrust Spring Lock Washer
22
1
Balance Piston Housing
(Foot Mount Only)
XX
53
2
Thrust Hex Bolt
23
2
Cups
XX
54
8
Hex Bolts
24
1
Rotor Housing
XX
63
1
Power Rotor
XX
25
1
Seal
X
64
1
Pipe Plug (Steel Only)
26
1
Tube
71
1
Tubing (C Face Only)
27
2
Tube O-ring
X
80
1
Seal Seat Adapter
(O-ring Seat Seal only)
28
2
Housing & Inboard Cover
O-ring
X
83
1
Seal Gasket
X
29
1
Thrust Plate
XX
86
1
Power Rotor Balance Piston
(C-Face Only)
XX
30
16
Washers (8 on C-Face)
79
2
90° Tube Fitting
(C-Face Only)
31
1
Key
88
1
Inlet O-ring
(Axial inlet pumps only)
X
38
1
Seal Spacer*
95
8
Nuts (C-Face only)
42
2
Retaining Ring
X
X = Minor Repair Kit Items.
XX = Major Repair Kit Items. (Items marked (X) are included in Major Repair Kit.)
* = Not used in “DKH” pumps.
H. PUMP MAINTENANCE
WARNING
Failure to observe precautions while installing, inspecting and maintaining pump can cause injury to
personnel from accidental handling of liquids that may harm skin or clothing, or fire hazard risks from
flammable liquids, or injury from high pressure fluid jets.
DANGER
BEFORE working on equipment, make sure all power to equipment is disconnected and locked-out.
H.1 GENERAL COMMENTS
NOTE: Part number identifiers (IDP) contained within parenthesis, such as (9), refer to circled
numbers shown in pump parts list Tables 2 and 3 and on assembly drawings (figures
3 through 7).
De-energize driver before starting with any maintenance action.

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H.2 TOOLS REQUIRED
Procedures described in manual require common mechanics hand tools, a torque wrench, dial
indicators for alignment and a suitable lifting device such as slings, straps, etc.
H.3 PUMP DISASSEMBLY PROCEDURES:
NOTE: _G3D_-350_ and 400 pumps incorporate highly finished precision parts that must be
handled carefully to avoid damage to critical machined surfaces. Parts removed
should be tagged for identification and their exact positions in pump carefully noted so
new parts, or same parts, are properly replaced without damage.
CAUTION
Fluid leakage from disassembly of pump may make floor slippery and can cause personal injury
SPECIAL NOTE: To service mechanical seal and ball bearings ONLY perform H.3, Steps 1
through 5 and H.4, Steps 7thru 11 Only.
Determine pump model identification identified on pump nameplate to select applicable pump
assembly shown in Figure 4 through 7. Refer to that assembly for following instructions.
1. Close suction and discharge piping to pump. Vent pressure from pump. Disconnect
piping. Remove drain plugs (5 or 32) or seal tubing (35, 36, 57, 42, 71, 79) on C-face
pumps, and drain unit. Remove pump from driver, coupling and base plate. Remove
coupling hub and key (16 or 31).
2. Remove bearing retainer (17 or 43) from inboard cover (9 or 46) by removing bolts (18 or
47) (and lockwashers (30) if present).
3. Remove assembled power rotor (11 or 63) from inboard cover (9 or 46). Removal of
power rotor (11 or 63) includes removal of snap rings (13 or 42), ball bearing (15 or 49),
seal spacers (14 or 48), and mechanical seal (25).
4. Disassemble power rotor (11 or 63) as follows:
a. Using a flat nosed tool, such as a screw driver, remove snap rings (13 or 42) from
groove in power rotor (11 or 63) on both sides of ball bearing (15 or 49).
b. Sealed ball bearing (15 or 49) is assembled to power rotor (11 or 63) with light press
fit. Ball bearing (15 or 49) may be removed by using bearing puller or vertical arbor
press. When using press, place two pieces of key stock through openings of
mechanical seal seat adapter (14 or 48) underneath ball bearing (15 or 49) on both
sides of power rotor shaft. Key stock should be long enough to support power rotor
(11 or 63) as it is placed in press. Position press ram against power rotor (11 or 63)
coupling end face. Gently press power rotor (11 or 63) through ball bearing (15 or 49).
Ensure power rotor (11 or 63) does not fall to floor once ball bearing (15 or 49) is off of
its diameter.
c. If pump has no seal (DKH design in figure 4 or 6), power rotor disassembly is
complete. Remove spacer (14 or 48) and skip to step 6. If pump has mechanical seal,
proceed with step (d).

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For steps (d thru g), refer to figure 3, mechanical seal drawing.
d. If stationary seal face is “J” type, remove spacer (14 or 48) and “J’ type stationary seal
seat from power rotor (11 or 63).
e. If seal is O-ring type, remove seal seat adapter (14 or 48) with stationary seal seat.
Remove stationary seat with O-ring from seal seat adapter (14 or 48). Discard O-ring.
f. If single spring, rubber bellows seal, remove rotating seat from shaft (11 or 63), If
multi-spring seal, disengage set screw and then remove rotating seal seat.
g. Remove spacer (38) from shaft.
5. Remove gasket (44 or 83) from inboard end cover (9 or 46).
6. Remove inboard cover (9 or 46) by removing bolts (10 or 4) or nuts (95) if Size 400, C-
face unit. Also remove washer (30 or 92) where applicable.
7. Remove and discard gasket (8 or 9) from inboard cover (9 or 46) or O-ring (6 or 28) if
pumps are C-face design.
8. On C-flange pumps ONLY, press bushing (33 or 86) from cover (9 or 46). Cover may
require heating to loosen Loctite before bushing (33 or 86) can be removed. Do not heat
to more than 250°F.
9. Remove inlet head (26 or 2) from case (1) by removing bolts (10 or 54) (and lockwashers
(92 or 30) if present). Remove and discard gasket (8 or 9) or O-ring (88) from inlet head
(26 or 2).
10. Remove thrust plate (21 or 29) and spacers (22 or 51) by removing bolts (23 or 53) and
lock washers (24 or 52)
11. If idler cup design, remove cups (20 or 23) from idlers (19 or 21).
12. Remove idlers (19 or 21) from housing (2 or 24) by unscrewing them from housing bores.
CAUTION
ATTENTION
Do not permit idlers (19 or 21) to drop as they emerge from housing (2 or 24).
13. Remove housing spacer (43 or 50) from case (1).
14. Remove pin stop (46 or 6) and fastener seal (45 or 7) from case (1).
15. If pumps are not C-face design, remove balance piston housing (47 or 22) with O-ring (6
or 28). This can be accomplished by pushing on suction end of housing (2 or 24) until
balance piston (47 or 22) emerges.
16. Remove and discard balance piston O-ring (6 or 28).
17. Remove tube (4 or 26) with O-rings (5 or 27) from housing (2 or 24) or balance piston
housing (47 or 22). Discard O-rings (5 or 27).

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18. Remove housing (2 or 24) and O-ring (6 or 28) from inlet end of case (1). Discard O-ring
(6 or 28).
H.5 PUMP ASSEMBLY
NOTE: Prior to assembly of pump, clean and inspect all parts for nicks and burrs. Replace
all worn or damaged parts. Imo Pump recommends replacement of all O-rings (6,
28, 88), gaskets (8, 9, 44 or 83), mechanical seal (25) and ball bearing (15 or 49)
when these parts are disturbed from their previously installed positions. Coat all
parts with light lubricating oil to assist in assembly. Inspect power rotor (11 or 63)
shaft and remove any nicks or burrs which are present. Polish power rotor shaft to
remove any rust or oxidants that may be present under shaft sleeve.
1. Install O-ring (6 or 28) in groove in housing (2 or 24). Install O-rings (5 or 27) in grooves
in tube (4 or 26) and install tube (4 or 26) in housing (2 or 24).
2. Install housing (2 or 24) O-ring end first, in pump case (1) from suction end until stop pin
(46 or 6) slot is properly aligned. Install stop pin (46 or 6) with fastener seal (45 or 7) in
case (1).
3. If pump is C-face version (Figure 5 and 7) proceed below. If pump is foot mount, skip to
step 4:
a. Clean and dry inboard cover (9 or 46) and balance piston bushing (33 or 86) mating
surfaces with solvent. Wipe Loctite “T747” Primer or equivalent onto the mating
surfaces of bushing (33 or 86) and inboard cover (9 or 46). Allow 1 to 5 minutes until
primer is visibly dry. Apply Locitite 609 or equivalent to bushing (33 or 86) and
inboard cover (9 or 46) mating surfaces. Assemble bushing (33 or 86) into inboard
cover (9 or 46). Allow 10 minutes to dry before proceeding with assembly.
b. Install O-ring (6 or 28) on inboard cover. Install inboard cover (9 or 46) into discharge
port side of case (1) using bolts (10 or 95) (and lock washers (92 or 30) if present).
Ensure seal vent (57 or 5) is facing up and pin (4 or 26) in housing mates with hole in
inboard cover (9 or 46). Torque bolts (10 or 95) to value on assembly. Skip to step 7.
4. Install O-ring (6 or 28) on balance piston housing (47 or 22).
5. Install balance piston housing (47 or 22) in case (1) lining up hole in balance piston
housing (47 or 22) with pin (4 or 26) in rotor housing (2 or 24).
6. Install gasket (8 or 9) on inboard cover (9 or 46).
7. Install inboard cover (9 or 46) into discharge port side of case (1) using bolts (10 or 4)
(and lockwashers (92 or 30) if present). Ensure seal vent (32 or 5) is facing up. Torque
bolts (10 or 4) to value on correct assembly drawing.
8. Assemble power rotor (11 or 63) and mechanical seal (25) as follows:
Note: If no mechanical seal (DKH design in figure 4 and 6), assembly spacer (14 or 48) in
inboard cover (9 or 46) and skip to step (f) below. If pump has mechanical seal proceed with
step (a) below.
a. Assemble spacer (38) onto shaft (11 or 63).

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For steps (b) – (e), refer to figure 3, mechanical seal drawing.
b. If seal is a single spring type rubber bellows type, apply light coat of system fluid to
inside diameter of bellows and slide mechanical seal rotating assembly on power rotor
(11 or 63) until it seats against the shoulder of seal spacer (38). Wipe seal face with
isopropyl alcohol and a lint free rag.
c. If seal is a multi-spring seal, coat O-ring inside of rotating seat with system fluid and
slide mechanical seal rotating assembly on power rotor (11 or 63) until it seats against
the shoulder of seal spacer (38). Tighten rotating seat set screw. Wipe seal face with
isopropyl alcohol and a lint free rag.
d. If seal has a “J” type seat, clean it with isopropyl alcohol and a lint free rag. Then put
a small amount of clean system fluid or light oil on its running face and install the
running face against the stationary seat face.
e. If seal has O-ring type stationary seat, install O-ring in groove of mechanical seal
stationary seat. Install seat including O-ring in seal seat adapter (14 or 48) ensuring
that groove in back of stationary seat mates to spring pin in seal seat adapter (14 or
48). Clean seal face with isopropyl alcohol and a lint free rag. Put a small amount of
clean system fluid or light oil on seal running face. Install the rotating ring running face
against the stationary seat face.
f. Install inner snap ring (13 or 42) in groove of power rotor (11 or 63).
g. Press bearing (15 or 49) on power rotor (11 or 63), pressing only on inner race of ball
bearing (15 or 49) using an installation sleeve until it is located next to inner snap ring
(13 or 42).
CAUTION
ATTENTION
Ball Bearing (49) will be damaged if installed by pressing on outer race.
h. Install outer snap ring (13 or 42) in groove of power rotor (11 or 63).
9. Install gasket (44 or 83) in inboard cover (9 or 46). Gasket may come with replacement
seal. Gasket (44 or 83) not required with DHK pump (see assembly drawings 4 and 6)
10. Install assembled power rotor (11 or 63) in pump, centering all parts as they enter inboard
cover (9 or 46). Align one of openings in spacer (14 or 48) over drain in inboard cover (9
or 46).
11. Install bearing retainer (17 or 43) on inboard cover (9 or 46) using bolts (18 or 47) (and
lockwashers (30) if present). Torque bolts (18 or 47) to value on assembly drawing
12. Install idlers (19 or 21) into housing (2 or 24) by meshing threads with power rotor thread.
13. If idler cup design, install cups (20 or 23) on idlers (19 or 21).
14. Install spacer (43 or 50) on suction end of case (1) flush with edge of housing (2 or 24).
15. Install bolts (23 or 53) and lock washers (24 or 52) in thrust plate (21 or 29). Install
spacers (22 or 51) on bolts (23 or 53).

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16. Install thrust plate assembly including thrust plate (21 or 51), washers (24 or 52), bolts (23
or 53) and spacers (22 or 51) on housing (2 or 24). Torque bolts (23 or 53) to value on
correct assembly drawing.
17. Install gasket (8 or 5) or O-ring (88) in groove in inlet head (26 or 2).
18. Install inlet head (26 or 2) using bolts (10 or 4) (and lockwashers (92 or 30) if present).
Torque bolts to value on correct assembly drawing.
NOTE: Inlet head (26 or 2) can be rotated and repositioned in 90 degree increments to
suit suction piping. To change inlet position remove bolts (10 or 54) and rotate
inlet head to desired position. Install bolts (10 or 54) and torque to proper values
indicated on assembly drawing.
19. Install coupling hub key (16 or 31). Install and align pump and driver as specified in
General Instruction Manual, SRM00046.
FIGURE 3 – MECHANICAL SEAL DRAWING

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I. TROUBLESHOOTING
For assistance with troubleshooting see General Instruction Manual, SRM00046 or SRM00101 if pump is
CE certified.
J. FIELD AND FACTORY SERVICE AND PARTS
Imo Pump maintains a staff of trained service personnel that can provide pump installation, pump start-
up, maintenance/overhaul and troubleshooting supervision as well as installation and maintenance
training.
Our factories provide maintenance as well as overhaul and test facilities the in event user prefers to
return pumps for inspection or overhaul. Factory-overhauled pumps are normally tested and warranted
“as-new” for a period of one year from date of shipment. For either field service or factory overhaul
assistance, contact your local Imo Sales Office or representative at Technical/ Customer Service
Department in Monroe, NC, USA.
Most pumps have repair kits available. Minor Repair Kits are used to repair leaking seals, bad bearings
and/or for re-assembly after pump tear-down. They include (as applicable) pump shaft seals, packing, all
gaskets/O-rings and bearings. Major Repair Kits are sufficient to rebuild completely worn-out pumps to
“as-new” condition. They include all parts found in Minor Repair Kits plus all major internal parts subject
to wear. Since kits have all necessary parts, kit purchase is preferred rather than selecting individual
parts. When parts are individually selected from Parts List, some needed components are often
overlooked. In addition, mixing worn or used parts with new parts risks rapid wear and shortened service
life from new parts.

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©2018CIRCOR International all rights reserved.
CIRCOR Pumps North America LLC
1710 Airport Road
PO Box 5020
Monroe, NC USA 28111.5020
Tel:[phone]
Toll: +1.877.853.7867
Email: [e-mail]
Web: circorpt.com